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• Table o-10 <br />Chemical and Physical Properties of Overburden Sandstone and <br />Shale (Unit 1) for Phase II Samples Collected at Nulca Mine, <br />November, 1986 <br />Parameter Phase II Hole Number2 <br />Units 873E 874E 875E 876E Nean SD3 <br />pH 6.8 7.3 7.4 - - 7.2 0.3 <br />EC4, mmhos/cm 3.2 0.9 3.4 - - 2.5 1.4 <br />SPS, °0 41.2 32.0 39.0 - - 37.4 4.8 <br />Ca, meq/1 17.4 -- -- - - 17.4 -- <br />Mg,meq/1 14.4 -- -- - - 14.4 -- <br />Na, meq/1 17.5 -- -- - - 17.5 -- <br />SAR6 4.1 -- -- - - 4.1 -- <br />Total S, % 0.18 0.45 0.99 - - U.54 0.41 <br />Sulfate S, % 0.09 0.38 0.84 - - 0.44 0.38 <br />• Pyrite S, 7 0.02 0.04 0.03 0.03 0.01 <br />Organic S, ~ 0.07 0.03 = <br />0.12 = <br />0.07 0.04 <br />NP7 71.2 116.5 68.8 - - 85.5 26.9 <br />ABPB 68.4 114.3 64.1 - - 82.3 27.8 <br />Fe, ppm 163.3 8.4 10.Z - - 60.6 88.9 <br />Mn, ppm 2.6 0.6 0.4 -- 1.2 1.2 <br />Ni, ppm 0.3 -- -- - - 0.3 -- <br />Zn, ppm 0.6 -- -- - - 0.6 -- <br />Mo, PPm 0.2 -- -- -- 0.2 -- <br />lUnit 1 consists of brown sandstone and gray shale above the upper Dakota <br />2Coa1 seam. <br />For drill hole location, see Exhibit 6-3A, Overburden Sample Locations. <br />45D-Standard Deviation. <br />5EC-Electrical Conductivity. <br />65P-Saturation Percentage. <br />75AR-Sodium Adsorption Ratio. <br />NP-Neutralization Potential; Units are tons of CaC03 required per acre <br />8furrow slice. <br />. ABP-Acid Base Potential; Units are tons of CaCO required per acre furru~.~ <br />slice; ABP was calculated from Pyrite and Organ~c S. <br />6-45 Revised 11/01/86 <br />